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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbaf268e39abed22b6283a4efac5f3e2f0ecc7eb4b7b4fc0ff29d81e4b7c667' 
  AND token = 'Bqdl2bqZDf2WHbJKlQsUcNTymq1+HCIOiQ8i3s+vODE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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