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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1cd53e0183e80b5c209d56b7d111eddd0e38e2f87d84bfc7250506c130b8a3' 
  AND token = 'PRtqllE52aV6tHoE0aN/EkS5ey+a1Zr/JL7decCJr54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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