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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd0986b757d255dce95c090c9566a1791f60e4131dfba84accd31e77ab653b1' 
  AND token = 'Ydoexz1HQ8kidYQbOJ4YZXFcNVsrfevA8/Q4Kshb7mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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