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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc79ab60f90f1bb5c9a2eb53a24410e1731844411fad17c7a025440c2b70986d' 
  AND token = 'mPAkr2vQey9F7mJOrJbh0MSKRyZEAF7Z7tFMgONMNhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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