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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb4642479f96e2e21c464c8d2cd113dab4dea7a3cafba427a5108e4ec98f22c' 
  AND token = 'A3yatA7Zid8BVI7QvQcGaHWTDdX2Tdn8XkSF7NAKmls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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