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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02869f96de1f7aa3767c7bb25352b812c5b6976e64cc063a82b53c2c4c6bff8f' 
  AND token = '0b/MOxfnYeR9qxMKBpMzS7Gvmztt5jmEXdH8fOPlsFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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