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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eee34dfc1d790dd15ba26d56a97a3360bbf403e1b69d2e5f6745929c0d7ad10' 
  AND token = 'AmT8YD9klWIz1vZ4LGW7VhKp1kJVAP9oouqsXl9U0IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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