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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8cd2d6cefd055ba4be56020c33eae8a15a04f40e95f95b11d5e479e418534ba' 
  AND token = 'dzigK4peo4i2Rsqi2Ry9RSbEFv3gtVKeAgIazb9f2Z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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