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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498aef178d546123ce07aedb5b95b23bfcf00b686df61a70b9f0d72ee1d2df69' 
  AND token = 'TDvEdFzaCDqtMt99wZBF4Y83lt+xXOCNf3/9pIuwQHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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