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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575b36942ae51d7924574634eb2a175fb4d6ab6a48f37a5f16ce47075a01f142' 
  AND token = 'k0rg4zenOk6uOkZgn+gkcRRioIar1bwz9awag/leH5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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