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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80744f43462281de0aa0edce5a831f02d738a29ab56abc01ea424227b9394409' 
  AND token = 'Ex966mHVGRPvVVfT9Ch5Kliw3dagtkXV4s0QCmAajyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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