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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724d4beca36cb086a5d6f2ea3ebc3c32a1c76a6b68fea73873a3571f19cf78cb' 
  AND token = 'tXoVXr7JrIHFUBct0BdcYoQtCHFOD2k72Bga/GIj32U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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