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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7d5217807bbe26c1cfdd2214e4f357bbf5528d209e3d24824afe20a65d279b' 
  AND token = 'UqdO0tlk5nk5nwdc4ayFJuAnBd3R+3LCRRqq/9gDCK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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