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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c12d52477c4467ccc716262e3cc0a60042597bd27f0707a42ff63868f1aa73' 
  AND token = '03/KIu8Y+lQfsg2dp2BSIU4oIY3SSZ7tmV1Ox32wlzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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