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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f70bf9c2b0818636d4d737b544a481fd2fce2111fc015efabf530a6e0d5bd7' 
  AND token = '4kysPRiNjm01vF0ZfJA83eXd0W0KsMsKyIBr8eZhpMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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