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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485759ea4d0c56ffddfd3060a47b210ecb3582fd00972c3730400a1be4e47466' 
  AND token = '0oBus62eaQoPJ1XLsPcJNzmcl3EEVnODrsivruDBvkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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