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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1eb5b2f5cbb7ac96347f2addd4818514fd51d44d682127f7f473ea66ac170bb' 
  AND token = '3bpZug71a8c1f4AiH6id3wQIdHuvL3DEpGDSHfQk+3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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