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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3feb2ff999ed03432766b175a0d737c296f4cc594b94ff1bd98dba7ecfa344' 
  AND token = 'c8Wdo4TJeKtDbkEjemlweVH/HujUtiQIjRo+0wmy2bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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