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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c48804d8a5763d959b3c4802f6fccc1a410f3d8eb594f378677d7713218628' 
  AND token = 'dWFZnPZVpy72/hxefisHpeIaWRJGz+xBT6+WToWFAr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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