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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05d20a4a842b7af409f2005b2503da84f8f7bd88ae6768017cf15ebff690e2d' 
  AND token = 'MNyYCPK2gNgOD//TYgyuimfZZWPq9+mnOa40k9ZNS9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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