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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59acd8e1e1177cc532820092a6d3f219c8475d9172c21fe061bd3878383aea3' 
  AND token = 'Omatk5Yx7Pa3gNc0QeAYtzO3IuF/W8CrG9bTeysizSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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