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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca96ca80211b6bf5e479158eb2d5cd1ca1fa589ab67f8183afe436fa35f12e77' 
  AND token = 'f2/WiYgsSw+N6/rK3b0PFXGW0rDf+KDR/XSRukjLZyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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