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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d39b094694ac9601acbbf86a675a430c5f79a7ba0c460600eb5af4879c8533' 
  AND token = '465fPC3pDLEukNzX+9CfEWt++phb4AGXvI6OW5pKS5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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