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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7152980fb921918f42e2037d644d099f2e62c027aa9bde06fda93077093cd2f' 
  AND token = 'aROc2xq0pe2lEfSKz/7idpGqlgcK0qoOzKURVknIh9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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