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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a92b97e6f7050d565f464b0545acad2d477afef7f98063e184fea1b1c9ab34e' 
  AND token = '4KhyU+e0Rd4PvN5P/9SysECeM+o7irza9IV4lQLPTrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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