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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5f7dde41795abb78849b38723044115a34bb4664abc121b748566fb41132eb' 
  AND token = 'ye2xNwU0Vzm2avCD36q1EygM6UM2FpR+quVVovbg0jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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