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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a1a54c7da7cd8a59e6a1bf33f7895fe6915faf1ca6f817a30982a6049ef34d' 
  AND token = '1odAL2Nlg767wKSl/ExqHU5hJfFsJzdQB6H/HL6qcU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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