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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46135bd3923a7a2061165b78862550201c0634ccd5f05d81e6fc24d8be35f5e9' 
  AND token = 'Mc4sEOL71aDsDzD/7Deydait5BdMi4jj/R5P4Fl7naA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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