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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad51eb8c707d5470d9bab8f0d8a7b9170e11ba6537816fa52d4af0f2257eb558' 
  AND token = 'T3PU/sdURNipRyrmptmfLtqbhdqDpGbW3CWdnGcLLSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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