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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac752e68cadbf0cd6048206a8239d7ae99375a3d285c4b6820563c098086172' 
  AND token = 'iTmxaX/A+NAU7l/8Y7aunKx1hs4OJVM3Bi8IaHPv/Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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