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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0c530867c5287b9e0d3bcce0e86f5eebcda1c9757511a266a7165c25e577ed' 
  AND token = 'aGaKF4U5PGZ6ScmXvoihyewvv9hg4zH9XyA0nVJX/Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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