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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02c71fdfc1f5ab13a12ea6f5d661f2c38c009473acd26994be83f508723bbdb' 
  AND token = '0RV+wAk+hrq6a0uT1l1KH4xXJpQcBJDMlqwbMqfavKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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