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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1060cea3f6f6257a0d127409c5318a4b8285ee3d4f60f79cba03283d2527f8' 
  AND token = '7ocpE0pn0Czp1QJ60KUydTPwkeiTuE0gBTl1Y7K9E3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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