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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6bdbfaa7ab8a38059d9d9032450558418e30e5a74d2f325be5b4860a24ac07' 
  AND token = 'N8nTPjeVZj8hvlTC/ZOuR1+0s6n7et76qlNOkYvh9MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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