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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b22df8becd7f4ee55a7f61307460da2b9a2d0bd2cdfa0cc99d26bb68e795ea6a' 
  AND token = 'Ranyms/0b9cvbgq4ghn4T2rjduc0pHQuRp+4sn4EJyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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