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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a34ea8f040ef55a41951064175f05da8bec11e72d6f863ec16836cae9428de' 
  AND token = '4Z/cP2XcGngmA4dg2K4PGEI+28u10aUH2cfG48COssc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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