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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba82d914da74be87c9b805d17a918306d77527284832e1d0c2f18a32c42d9e29' 
  AND token = 'qDmf8skHDCHkBZsyONVniWT1HWh5zr3Ncir7biCBrPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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