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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e456945cd9267886975ad834cd3b66db6b89037355466f614f528ca5d0ed81a' 
  AND token = 'Etgmgma35bF4FOBmBrS+thlA1r5ExVFZLJ1P1ayXFLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00700

JSON explain

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