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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2679759d3ae6b2e91f25d9f762f6bb01efe88b4a6c6f97207d40e78975fa09b' 
  AND token = 'Z5J8vFoobAMGI3ScAcLfuiNU1O+ec8DTiXlKHOHQ83c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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