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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f97762b607487c654be2b35d7a06e1c992709a59b6284236e51549fd744a5b' 
  AND token = '1Z9CRU2HHUbzO0Q7ziNCjbiLpYHj/FW3FNSIH0vjHao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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