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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863793852328622379eb76b1e634214439442f4f3313114117ee4bb030b2313e' 
  AND token = 'dCd8wKpM7/bCf5EXLlkC3oObGOf0ftxrp0mcSXoO6aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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