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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9839007f6683b2b8d98e220628502d357535f4d942e5e878e5e11a56dd90dfdb' 
  AND token = '/1o/pWPZ5so1Sx9L0gdcN+ZQgGFvn3HaQQVnLMhZtFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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