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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1227c850eeb5d0e5382f82679d6249ed53518ded168a559ad4b9a7ac745518' 
  AND token = 'VChGiNb8JJBXDaqgHQcVmH4vx8mBSMLJbU8KigrkaCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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