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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a029b35d37164963a5d68418384d906ff47526a6c83266c3c62d91d4c0540be5' 
  AND token = 'jgNJiZ1X/ucrcDNxBa5s7kDiLFoX9UviZ/5hPDJkHes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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