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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa6ce8363072aab677c650d4fa1a8d7f580c25ae9b1c439a1906e80c048712a' 
  AND token = '0DVn5+blv/gfZIBQ5KvIVgNBHeWId3IuKI001vuFVPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}