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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c01ab360ae23de11951fe2d2e2638f48850ae808f363880dc7f480fe0a7ba6' 
  AND token = '3mvS7mQsPpQ2AF+pu4BOil/nhjlPRTd4ehB1IpAaIps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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