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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35293314ff145991c22db88fc6f2fae435906f02cba167ee46709cb6d52b34df' 
  AND token = '6ilXI01aYRP7GrErgBcPI2dR3RCUDAzeksTSL7Att1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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