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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd122cb5bdcb9b39caa5d587d44213678fd38e05b06ad975aa7241ba587040a0' 
  AND token = '6YibiOtOY68z4soi5X/c4pkF9dauJJA9btm4Ii0Fi3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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