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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3af985cffcbd7f3092ec05a08ee9a38883919203b5c256b4d3d31325565a80' 
  AND token = 'yrG4lTfRtQrj4+SlJf22LED61t9YiCKfgw7EkqkGkpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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