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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0693125e4e2d8691509bca189d15e8658ecbf653300b127a47f6c53c11ddd51' 
  AND token = '+ksXFpPn03innbupd2taRStWPnTMrsQRAnSLyZZCYnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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