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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d5f52559eb3ecf6d1b4b4d7ed5e2d82eba93876f11e35b967e75b071c6d143' 
  AND token = 'z+yMeYYKuw7rtVuNxpebLYsuEu29Hc8KqWMwNPKlXGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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