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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724401b71ce61f8ada4cac9b5c5c1aabf46d875c91a3784c4f2e272f6d14fc61' 
  AND token = '/0c+stOuJOPfM4XJdcb2/ZDwOAekEDNz+3BA1pa6Hak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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