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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0de1346a94c0896e2a323d50738456923ff7d47243e9259c083ef8eb5512e3' 
  AND token = 'Og/FyeaLDUKdsIsYuBrNE3v0LFRfBIYTW8nLue1ipFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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